JPS586488Y2 - Coagulation device for dehydrator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flocculation device for mixing water treatment sludge with a flocculant as a pretreatment for supply to a dehydrator.

Conventionally, in the above-mentioned equipment, water treatment sludge is simply flocculated, and the dewatering process is particularly heavy for low-concentration sludge. There was a drawback that it was not possible to perform a process with good dehydration performance.

In view of the above-mentioned circumstances, the present invention has been developed to improve the dewatering performance of a dehydrator through a simple improvement using a structure for flocculation treatment, thereby reducing the concentration of filtrate with low water content and suspended solids. The purpose is to be able to recover filtered water with low filtration.

Next, aspects of embodiments of the present invention will be described in detail based on illustrative drawings.

The treated sludge collected in the water treatment device 1 is supplied in parallel to two flocculation devices 3 through the pump channel 2, and the sludge after the flocculation treatment is supplied to the belt press type dehydrator 4, and the filtrate is The sludge treatment equipment is configured to collect the filtered water into the hopper 5 and the flow path 6.

The flocculation device 3 includes a supply pipe 7 for an organic flocculant such as a polymer flocculant typified by polyacrylamine or polyethylene amine, or an inorganic flocculant such as aluminum sulfate or ferrous sulfate; A branch supply pipe 8 for water treatment sludge from the pump flow path 2 is connected to a mixing tank 9, and a stirring device 12 consisting of a rotary drive device 10 and a stirring blade body 11 connected thereto is connected. The sludge-containing water in tank 9 is rotated and flowed in the tank, and the supplied flocculant and water treatment sludge are stirred and mixed. A dewatering device 13 is provided for the sludge-containing water in the tank, and a supply pipe 14 for coagulated sludge to the belt press type dehydrator 4 is connected, and an on-off valve 15 is provided in each of the supply pipes 7°, 8, and 14. The flocculated sludge is alternately supplied to the belt press type dehydrator 4 by selectively opening and closing the valves 15 in the two flocculating devices 3, 3.

As shown in FIG. 2, the dehydration treatment apparatus 13 is constructed by integrally connecting cylinder support shafts 17 and 17 on both sides of a cylindrical frame body 16 concentrically with the frame body 16.
A filter cloth 18 is stretched around the circumference of the hollow rotating body 19 to form a hollow rotating body 19 having a filtration part, and a part of the circumferential wall of the filtering part of the hollow rotating body 19 is connected to the water surface of the sludge-containing water in the tank. The suction pump is located above the sludge-containing water and is installed over the tank wall so as to be rotatable around the horizontal horizontal axis that intersects with the swirling flow direction of the sludge-containing water, and a rotation drive device 35 is connected thereto. A conduit 21 with a compressor 20 and a conduit 23 with a compressor 22 are disposed inside the hollow rotary body 19 through the cylinder support shaft 17, and the suction conduit 21 of these is connected to the bottom side of the hollow rotary body 19. The nozzles 24 are opened to suck and discharge the water in the hollow rotating body that has permeated through the peripheral wall filtration part, and the nozzles 24 are used to spray a large number of gases at intervals in the longitudinal direction of the other pipe 23. ... is provided, and its nozzle 24 is disposed not along the peripheral wall of the filtration section located above the water surface, and the sludge adhering to the filtration section is removed from the filtration section by back pressure. A cover 25 is provided to allow the sludge to be peeled off, to prevent the sludge blown away by the reverse pressure peeling from spreading, and to return it into the tank.

That is, the mixing tank 9 constituting the flocculation device 3 is used, and a rotary body 19 having a filtering section is provided in the sludge-containing water stored therein, and the filtrate is treated at the same time as the flocculation of the water treatment sludge. At the same time, the sludge adhering to the filtration section is continuously gas-separated to ensure good filtration and dewatering.
The flocculated sludge with a lower water content and a smaller dewatering load is supplied to the belt press type dehydrator 4.

To configure the belt press type dehydrator 4, a large number of small holes are bored in the upper surface of a duct 26 to which a suction blower is connected, and a large number of rollers 27 are arranged in a zigzag pattern in the lower part of this duct 26.
In addition, a drive roller 28 is provided at one end of the duct 26, and tension rollers 29 and 29 are provided at the other end and the center of the upper part of the duct 26. Rollers 30 for pressure, filter removal, and meandering correction are provided, and two endless belt-shaped filter cloths 31 and 31 are wrapped around a group of these rollers, and one end of the upper part of the duct 26 is provided. A supply unit 32 for flocculated sludge is provided in the sludge, and a gravity dewatering zone A is followed by a screw pressure dewatering zone B, a compression dewatering zone C, and a shear dewatering zone D, whereby the flocculated sludge is sequentially dehydrated. ,
The filtrate is collected from the conveyor 32 to the hopper 5, and the filtrate is collected to the flow path 6, and the water content of the flocculated sludge supplied from the flocculation device 3 is low, so that the dewatering load is small. Because of this, it is possible to perform highly efficient dehydration treatment that lowers the water content of the collected filtrate and increases the throughput.

3 and 4 respectively show modified structures of the agglomerating device 3, and the one shown in FIG. 3 has a blade body 33 attached to the circumference of the hollow rotating body 19 having the filtering section. and filter cloth 1
Rotating body 19 for continuously eliminating clogging with respect to 8
The stirring device is constructed by effectively utilizing the rotating structure of
The special stirring device 12 can be omitted, and thereby the entire device can be made more compact.

What is shown in FIG. 4 is the flocculation device 3 of the first implementation structure shown in FIG. At the same time, the flocculant-mixed water is caused to overflow from the upper edge of the wall body 34 to the divided tank 9b equipped with the dehydration treatment device 13, and the sludge-containing water is dehydrated in the still water compartment tank 9b. At the same time, the flocculated sludge can be settled at the bottom of the tank 9b, and therefore 1
The flocculated sludge is continuously transferred to the dehydrator 4 using the base flocculating device 3.
It is also possible to supply

The dehydrator 4 can be modified in various ways, such as a centrifugal dehydrator.

In summary, the present invention provides a snow flocculation device in which a hollow rotary body having a filtering part on the peripheral wall around the horizontal axis is provided with the peripheral wall extending above and below the water surface of the sludge-containing water in the mixing tank. , a pipe line is provided for sucking and discharging the water in the hollow rotating body, and a nozzle is provided inside the hollow rotating body for blowing gas to a portion of the filtration section located above the water surface in the mixing tank. It is characterized by

In other words, by simply adding a filtration and dehydration device with an extremely simple structure to the flocculation device, it is possible to carry out pretreatment to lower the water content at the same time as the flocculation process, and as a result, the dehydration device The water content of the collected filtrate can be lowered, the amount of treatment can be increased, and the dehydration performance can be greatly improved.

Furthermore, since the sludge that adheres to the filtration section during filtration and dewatering is sequentially and continuously gas-stripped, the filtration and dehydration conditions with good performance can be maintained without reducing the sludge concentration. .

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the dehydrator agglomeration device according to the present invention, and FIG. 1 is a schematic longitudinal sectional view of the entire sludge treatment facility, and FIG.
The figure is a sectional view taken along the line II--II of FIG. 1, and FIGS. 3 and 4 are sectional views showing modified structures of the agglomerating device, respectively. 4... Dehydrator, 9... Mixing tank, 19.
...Hollow rotating body, 21 ... Suction and discharge pipe, 24 ... Nozzle.

Claims (1)

[Scope of utility model registration request] This is a flocculating device for mixing water treatment sludge and a flocculant as a pre-treatment for supply to the dehydrator 4, and includes a hollow rotating body 19 having a filtration part on the peripheral wall around the horizontal axis, the peripheral wall of which is inside the mixing tank 9. installed above and below the water surface of the sludge-containing water,
A pipe line 21 for sucking and discharging the water in the hollow rotating body 19 is provided, and a nozzle 24 for spraying gas onto a portion of the filtration section located above the water surface in the mixing tank 9.
A coagulating device for a dehydrator, characterized in that the above-mentioned hollow rotating body 19 is provided with: